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Soft/warm white light has a lower color temperature and brings out red/yellow tones, where as cool light has a higher color temperature and brings out blue tones.

Soft white generally has a temperature of 2700-3000K, a cool white is 4000K or higher. Daylight is around 6500K (quite blue). A neutral white would be around 3500K. Regular incandescent light bulbs are usually 2700K, as are most of the regular compact fluorescents...so they cast a bit of a red/yellow glow...and halogens are usually 3000K, so slightly "whiter". But CFLs come in all temperatures. "Daylight" bulbs are usually cool white, so they cast a bluish glow.
A cool white is good for work areas, the kitchen, and reading. A soft white is good for bedrooms and living areas (as it makes things "warm" and makes skin tones nicer).
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Replies, comments and Discussions:

  • 哪位义人能告诉我soft white and cool white 的灯泡有什么区别?
    • 色温不同,用的场合不同。soft适合卧室,family room,cool适合厨房和living room
      • 那建议kooky看有没有soft yellow的
        • should be cool yellow. oh, no, hot yellow
          • 岁数大了, 太hot的受不了8?
            • 唉,水缸大妈们呀,我撤了
        • 真看见这个soft yellow了, it's for party :)
          • 恩, 天天都party, 多浪漫呀 :)
            • 浪漫=幸福=阳光, 是这个理吧
      • thank you, 这个cool light是不是冷光灯,是接近阳光的灯光,用于摄影棚。
    • Soft/warm white light has a lower color temperature and brings out red/yellow tones, where as cool light has a higher color temperature and brings out blue tones.
      Soft white generally has a temperature of 2700-3000K, a cool white is 4000K or higher. Daylight is around 6500K (quite blue). A neutral white would be around 3500K. Regular incandescent light bulbs are usually 2700K, as are most of the regular compact fluorescents...so they cast a bit of a red/yellow glow...and halogens are usually 3000K, so slightly "whiter". But CFLs come in all temperatures. "Daylight" bulbs are usually cool white, so they cast a bluish glow.
      A cool white is good for work areas, the kitchen, and reading. A soft white is good for bedrooms and living areas (as it makes things "warm" and makes skin tones nicer).
      • thanks a lot, 色温的差异还挺大的,但瓦数是一样的吧?比如说40W soft white and 40 cool white
        • yeah, they are the same, they both use 40W. some people feel that the cool white light is a little brighter compared to a soft white.
          • 十分感谢义人+专家,我买这个是为了摄影. 一些专业词不懂,halogen, CFL是什么意思?